Update: my new photochromic Rx running glasses arrived and passed their first run with flying colors! It was a cloudy, overcast day, so they didn’t really get a fair test against the full-scale assault of the FL sun, but I managed to buy a cheap pair of frames online that aren’t superbly ugly, fit me properly, are incredibly lightweight, and didn’t annoy me once over 6 miles. That’s more than I can say for 90% of any other sunglasses or glasses I’ve worn running lol - being able to see clearly was just the cherry on top! I didn’t pony up the big dollars for the fancy Transitions because I don’t need them to change quickly, since outdoor light conditions don’t change that much in seconds here, and reviews said the fancy ones didn’t get appreciably enough darker to be worth the exorbitant extra cost. I suspect these won’t be as dark as I like for serious summer sun, but I also don’t plan to be running in the brightest light of day - and I’ve got regular, dark-tinted Rx sunglasses for non-running use. (I got the dedicated running ones without bifocals, whereas my regular use ones are bifocals.)
Thanks again to those who chimed in - I’m very glad I got these!